Over the last days replaced the MAF, vnt actuator and N75 on the Golf. Turbo was dead in the water, now it purrs again.
Also had the ac serviced, so the guy evacuates the system and was going to fill it again he tells me the compressor and fans aren't coming on, I said impossible I just tested it yesterday, he doesn't know what's going on so I took the car home and did some research.
Of coarse its not going to kick in if the pressure is too low, so I went back there today and told him that, he insisted there had to be something wrong and it should switch on even without pressure.
Had enough at that point and got a recharge kit, plugged it in, filled it to 30psi, turned the car on, fans and clutch came on, filled it up and all was well again.
Don't know why I even bothered with an "expert".